I am creating a wall using a UserControl ( which is a nested GridView) i want to load the rows of the GridView on scrolling down just like facebook. I am trying to implement this method.. Click MeClick here The example seems to read the last row's first column to get the last row which is loaded and to fetch next bunch of rows. I added a bound field to my UserControl's GridView but i guess i am not able to read the right value since i am getting error "Input string was not in a correct format." at ..